Latest meteorological guidance for Buenos Aires shows model consensus clustering around a daily maximum of 17–18°C on September 30, driven by mild springtime conditions with light northerly winds, variable cloud cover, and a modest high-pressure ridge limiting stronger warming. The near-even split between 17°C and 18°C outcomes reflects subtle differences in ensemble runs regarding peak insolation and boundary-layer mixing, typical for the season when average September highs reach 17–19°C. Official Servicio Meteorológico Nacional observations and final hourly data will determine resolution, with any late-day clearing or urban heat effects potentially tipping the exact peak by 1°C.